Return false from metadata_exists() if the get_$type_metadata filter returns a false value.

props xknown.
fixes #22746.

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Cap and theme support checks for the welcome panel.

props MikeHansenMe.
fixes #26276.

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Comments dashboard widget: Use the proper class to avoid stretched "unapproved" red lines.

fixes #26910.

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In is_serialized(), use substr() rather than array access, for compatibility with multibyte overloading.

props SergeyBiryukov.
fixes #18007.

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Filesystem: Fix getchmod() for direct and ssh2 transports, for directories.

props DavidAnderson.
fixes #26598.

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Use get_comment_link() in wp_notify_postauthor().

Fixes pagination for the link directly to the moderated comment.

props eatingrules.
fixes #26133.

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Avoid notices in wp_notify_postauthor() when a post has no author.

props drozdz.
fixes #26659.

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Twenty Eleven: only show secondary skip link on pages with secondary content, and remove duplicate title attribute in site title output. Props bcworkz, fixes #26950.
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Twenty Eleven: make sure top post meta output isn't broken on small screens. Fixes #27061.
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Twenty Twelve: remove unused `singular` selectors in print CSS block. Props jbkkd, fixes #26866.
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Twenty Twelve: style `select` element. Props ramonchiara, fixes #27434.
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Twenty Fourteen: merge two similar strings in Customizer featured content help text. Props celloexpressions, fixes #26647.
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Customizer: Use `esc_url_raw` to escape customizer URL settings to prevent double encoding.

props westonruter, ocean90.
fixes #26569.
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Clarify that unregister_default_headers() returns void in some situations. fixes #21876.

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Heartbeat: Hooks should always receive unslashed data.

This affects the privileged hooks; the unprivileged hooks already received unslashed data.

props johnbillion, TobiasBg.
fixes #27260.

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Style the cursor in the image editor in the media modal.

props tomauger.
fixes #27392.

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TinyMCE:
- Update the styling of the image caption and gallery toolbars.
- Fix issue where the hidden clipboard div in wpView.
- Switch to using the pencil dashicon for Edit.
- Add `max-width: 100%;` to images in the gallery preview and adjust column widths.
Props cramdesign, mattheu, gcorne, melchoyce, see #27320, fixes #27376, fixes #27354

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